Demo Escher 1 and Escher 2 do not work - border bug

[Alvarez81]

Demo Escher 1 and Escher 2 for borders do not work:
esh1_128.zip
esh2_128.zip

[Alessandro1970]

I tried these two demos myself.
The very strange thing is that if you take a screenshot the result is right.
Zxpoly displays the demo badly but it takes the correct screenshot. This is strange.

Screenshot from ZxPoly menu:

[raydac]

screenshot doesn't include border area, emulator makes only screenshot of display area

[raydac]

I still can't understand why I have such bug in border draw in emulator because its internal paint synchronized with frame timing between ints... may be some error of length for some instructions